arch/arm/Kconfig

arch/arm/src/stm32/stm32_freerun.c

arch/arm/src/stm32/stm32_freerun.h

arch/arm/src/stm32/stm32_tickless.c

include/nuttx/arch.h

include/sys/syscall.h

include/sys/time.h

sched/Kconfig

sched/clock/Make.defs

sched/clock/clock.h

sched/clock/clock_gettime.c

sched/clock/clock_initialize.c

sched/clock/clock_settime.c

sched/clock/clock_systimer.c

sched/clock/clock_timekeeping.c

sched/clock/clock_timekeeping.h

sched/sched/sched_processtimer.c

sched/sched/sched_timerexpiration.c

syscall/syscall.csv

syscall/syscall_lookup.h